Three-dimensional Positioning of Nanoparticles in Liquid Crystal Polymer Flim with Controlled Topological Defect
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Particle manipulation has been actively studied in colloid and optics fields. Self-assembly, lithography and optical trapping are representative strategies in particle positioning. However, reversible and three-dimensional particle position control is challenging with the reported methods. Here, I present liquid crystal polymer film with topological line defects, trapping the nanoparticles at desired positions and reversibly modulating their height in varied temperature. The included nanoparticles are predominantly located at kinks of the zigzag line defect generated in liquid-crystalline monomeric mixture under an in-plan electric field. In-situ UV irradiation on it completes the polymer film maintaining the controlled particle positions, which can change its surface into alternately wavy form at elevated temperature. The trapped particles are raised following the local maximum regions of the deformed wavy surface. This study will improve applicability and versatility in various particle manipulation system.